Inverse[m] gives the inverse of a square matrix m.
Inverse works on both symbolic and numerical matrices.
For matrices with approximate real or complex numbers, the inverse is generated to the maximum possible precision given the input. A warning is given for ill-conditioned matrices.
Inverse[m, Modulus->n] evaluates the inverse modulo n.
Inverse[m, ZeroTest -> test] evaluates test[ m[[i, j]] ] to determine whether matrix elements are zero. The default setting is ZeroTest -> (# == 0 &).
A Method option can also be given. Possible settings are as for LinearSolve.
See The Mathematica Book: Section 1.8.3 and Section 3.7.6.
Implementation Notes: see section A.9.4 and A.9.4.
See also: PseudoInverse, LinearSolve, RowReduce, NullSpace.
Related package: LinearAlgebra`Tridiagonal`.